"Tens of thousands of Americans will send a clear message to Donald Trump," according to the organizers. "The president is accountable to the American people, and he must answer to us."

RELATED: Check out protests against Trump's travel ban:

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NEW YORK, UNITED STATES - JANUARY 28: Immigration activists stage a protest against President Donald Trump's 90-days ban of entry on 7 Muslim-majority countries in JFK airport in New York, U.S.A on January 28, 2017.
(Photo by Mohammed Elshamy/Anadolu Agency/Getty Images)

Protestors rally during a demonstration against the Muslim immigration ban at John F. Kennedy International Airport on January 28, 2017 in New York City. President Trump signed the controversial executive order that halted refugees and residents from predominantly Muslim countries from entering the United States. (Photo by Zach D Roberts/NurPhoto via Getty Images)

NEW YORK, UNITED STATES - JANUARY 28: Activists stage a rally against President Donald Trump's 90-days ban of entry on 7 Muslim-majority countries in the Fourth terminal of JFK airport in New York, U.S.A on January 28, 2017. (Photo by Mohammed Elshamy/Anadolu Agency/Getty Images)

Protestors rally during a demonstration against the Muslim immigration ban at John F. Kennedy International Airport on January 28, 2017 in New York City. President Trump signed the controversial executive order that halted refugees and residents from predominantly Muslim countries from entering the United States. (Photo by Zach D Roberts/NurPhoto via Getty Images)

NEW YORK, UNITED STATES - JANUARY 28: Immigration activists stage a protest against President Donald Trump's 90-days ban of entry on 7 Muslim-majority countries in JFK airport in New York, U.S.A on January 28, 2017.
(Photo by Mohammed Elshamy/Anadolu Agency/Getty Images)

NEW YORK, NY - JANUARY 28: Protestors rally during a demonstration against the new immigration ban issued by President Donald Trump at John F. Kennedy International Airport on January 28, 2017 in New York City. President Trump signed the controversial executive order that halted refugees and residents from predominantly Muslim countries from entering the United States. (Photo by Stephanie Keith/Getty Images)

Protesters gather at JFK International Airport against Donald Trump's executive order on January 28, 2017 in New York.
US President Donald Trump has signed a sweeping executive order to suspend refugee arrivals and impose tough controls on travellers from Iran, Iraq, Libya, Somalia, Sudan, Syria and Yemen. Trump boasted Saturday that his 'very strict' crackdown on Muslim immigration was working 'very nicely,' amid mounting resistance to the order which has been branded by many as blatantly discriminatory. / AFP / Bryan R. Smith (Photo credit should read BRYAN R. SMITH/AFP/Getty Images)

Protesters gather at JFK International Airport against Donald Trump's executive order on January 28, 2017 in New York.
US President Donald Trump has signed a sweeping executive order to suspend refugee arrivals and impose tough controls on travellers from Iran, Iraq, Libya, Somalia, Sudan, Syria and Yemen. Trump boasted Saturday that his 'very strict' crackdown on Muslim immigration was working 'very nicely,' amid mounting resistance to the order which has been branded by many as blatantly discriminatory. / AFP / Bryan R. Smith (Photo credit should read BRYAN R. SMITH/AFP/Getty Images)

New York City Council Member Carlos Menchaca addresses a crowd during an anti-Donald Trump immigration ban protest outside Terminal 4 at John F. Kennedy International Airport in Queens, New York, U.S. January 28, 2017. REUTERS/Andrew Kelly

A crowd gathers during an anti-Donald Trump immigration ban protest outside Terminal 4 at John F. Kennedy International Airport in Queens, New York, U.S. January 28, 2017. REUTERS/Andrew Kelly

People gather during an anti-Donald Trump immigration ban protest outside Terminal 4 at John F. Kennedy International Airport in Queens, New York, U.S. January 28, 2017. REUTERS/Andrew Kelly

Protesters gather at JFK International Airport's Terminal 4 to demonstrate against US President Donald Trump's executive order on January 28, 2017, in New York.
Trump has signed a sweeping executive order to suspend refugee arrivals and impose tough controls on travellers from Iran, Iraq, Libya, Somalia, Sudan, Syria and Yemen. / AFP / Bryan R. Smith (Photo credit should read BRYAN R. SMITH/AFP/Getty Images)

Protesters gather at JFK International Airport's Terminal 4 to demonstrate against President Donald Trump's executive order on January 28, 2017, in New York.
Trump has signed a sweeping executive order to suspend refugee arrivals and impose tough controls on travellers from Iran, Iraq, Libya, Somalia, Sudan, Syria and Yemen. / AFP / Bryan R. Smith (Photo credit should read BRYAN R. SMITH/AFP/Getty Images)

Protesters gather at JFK International Airport's Terminal 4 to demonstrate against US President Donald Trump's executive order on January 28, 2017, in New York.
Trump has signed a sweeping executive order to suspend refugee arrivals and impose tough controls on travellers from Iran, Iraq, Libya, Somalia, Sudan, Syria and Yemen. / AFP / Bryan R. Smith (Photo credit should read BRYAN R. SMITH/AFP/Getty Images)

Protesters gather at JFK International Airport's Terminal 4 to demonstrate against President Donald Trump's executive order on January 28, 2017, in New York.
Trump has signed a sweeping executive order to suspend refugee arrivals and impose tough controls on travellers from Iran, Iraq, Libya, Somalia, Sudan, Syria and Yemen. / AFP / Bryan R. Smith (Photo credit should read BRYAN R. SMITH/AFP/Getty Images)

Protesters gather at JFK International Airport's Terminal 4 to demonstrate against President Donald Trump's executive order on January 28, 2017, in New York.
Trump has signed a sweeping executive order to suspend refugee arrivals and impose tough controls on travellers from Iran, Iraq, Libya, Somalia, Sudan, Syria and Yemen. / AFP / Bryan R. Smith (Photo credit should read BRYAN R. SMITH/AFP/Getty Images)

Protesters gather at JFK International Airport's Terminal 4 to demonstrate against President Donald Trump's executive order on January 28, 2017, in New York.
Trump has signed a sweeping executive order to suspend refugee arrivals and impose tough controls on travellers from Iran, Iraq, Libya, Somalia, Sudan, Syria and Yemen. / AFP / Bryan R. Smith (Photo credit should read BRYAN R. SMITH/AFP/Getty Images)

Demonstrators hang a banner from a multi-level car park during a protest against Donald Trump's travel ban outside Terminal 4 at John F. Kennedy International Airport in Queens, New York, U.S., January 28, 2017. REUTERS/Andrew Kelly

People participate in a protest against Donald Trump's travel ban outside Terminal 4 at John F. Kennedy International Airport in Queens, New York, U.S., January 28, 2017. REUTERS/Andrew Kelly

NEW YORK, NY - JANUARY 28: Protestors rally during a demonstration against the Muslim immigration ban at John F. Kennedy International Airport on January 28, 2017 in New York City. President Trump signed the controversial executive order that halted refugees and residents from predominantly Muslim countries from entering the United States. (Photo by Stephanie Keith/Getty Images)

NEW YORK, NY - JANUARY 28: Protestors rally during a demonstration against the Muslim immigration ban at John F. Kennedy International Airport on January 28, 2017 in New York City. President Trump signed the controversial executive order that halted refugees and residents from predominantly Muslim countries from entering the United States. (Photo by Stephanie Keith/Getty Images)

BOSTON, MA - JANUARY 28: Hundreds of people gathered for a rally at the Chinatown Gate in Boston and marched to the State House in a demonstration against President Trump's new immigration order the day after it was issued, Jan. 28, 2017. (Photo by John Tlumacki/The Boston Globe via Getty Images)

BOSTON, MA - JANUARY 28: Tori Furtado, from Boston, kneels down to write a sign that reads, 'Love has no borders,' in front of the Chinatown Gate, where hundreds gathered for a rally before marching to the State House in a demonstration against President Trump's new immigration order the day after it was issued, Jan. 28, 2017. (Photo by John Tlumacki/The Boston Globe via Getty Images)

BOSTON, MA - JANUARY 28: Hundreds of people gathered for a rally at the Chinatown Gate in Boston and marched to the State House in a demonstration against President Trump's new immigration order the day after it was issued, Jan. 28, 2017. (Photo by John Tlumacki/The Boston Globe via Getty Images)

BOSTON, MA - JANUARY 28: Hundreds of people marched down Kneeland Street in Boston after gathering for a rally at the Chinatown Gate in Boston before walking to the State House in a demonstration against President Trump's new immigration order the day after it was issued, Jan. 28, 2017. (Photo by John Tlumacki/The Boston Globe via Getty Images)

Protesters gather at JFK International Airport's Terminal 4 to demonstrate against President Donald Trump's executive order on January 28, 2017, in New York.
Trump has signed a sweeping executive order to suspend refugee arrivals and impose tough controls on travellers from Iran, Iraq, Libya, Somalia, Sudan, Syria and Yemen. / AFP / Bryan R. Smith (Photo credit should read BRYAN R. SMITH/AFP/Getty Images)

Protesters gather outside Terminal 4 at JFK airport in opposition to U.S. president Donald Trump's proposed ban on immigration in Queens, New York City, U.S., January 28, 2017. REUTERS/Stephen Yang

Port Authority Police Department block an entrance as protesters gather outside Terminal 4 at JFK airport in opposition to U.S. president Donald Trump's proposed ban on immigration in Queens, New York City, U.S., January 28, 2017. REUTERS/Stephen Yang

Protesters gather outside Terminal 4 at JFK airport in opposition to U.S. president Donald Trump's proposed ban on immigration in Queens, New York City, U.S., January 28, 2017. REUTERS/Stephen Yang

NEW YORK, UNITED STATES - JANUARY 28: Immigration activists stage a protest against President Donald Trump's 90-days ban of entry on 7 Muslim-majority countries in JFK airport in New York, U.S.A on January 28, 2017.
(Photo by Mohammed Elshamy/Anadolu Agency/Getty Images)

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Trump's tax returns

Trump broke with historical precedent by not releasing his tax returns during his run for the White House, claiming — falsely — that he could not release them because he was under audit.

On Oct. 1, a New York Timesreport found that Trump had declared a loss so large on his taxes in 1995 that he may have been able to avoid paying taxes for 18 years. But Trump still refused to release his full tax returns, leading critics to wonder if he was as rich as he claimed to be or if he had something to hide.

In January, after assuming the presidency, the Trump team announced he would not release his tax returns because "people didn't care."But an ABC News/Washington Post poll showed 74% of Americans, including more than half of Republicans, wanted to see Trump's tax returns — something the Tax March organizers are hoping to show the administration.

"On April 15, we're marching on Washington, D.C., and in communities across the country to show that we do care," the organizers wrote on their website. "And that we're not going away."